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Ya to late .. already factory reset mine... I mean that's how most of us
fix connection issues with the Chromecast so that was our first thought
was to factory reset... so many people have done this. Hopefully we can
fix this.
I'm having the exact same problem I guess all of the Chromecasts went
down at once and those of us who have factory reset run it not being
able to authenticate our devices... Super frustrating